CN115382008B - 一种适用于糖尿病创面修复的可注射水凝胶的制备方法 - Google Patents
一种适用于糖尿病创面修复的可注射水凝胶的制备方法 Download PDFInfo
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Abstract
本发明公开了一种适用于糖尿病创面修复的可注射水凝胶的制备方法,具体为:首先分别将制备得到的多巴胺还原氧化石墨烯pGO和Cu‑TCPP原位通过氢键复合制备形成pGO@Cu‑TCPP二维纳米片;然后将上述pGO@Cu‑TCPP二维纳米片掺杂到多酚接枝壳聚糖‑氧化支链淀粉可注射水凝胶体系中得到pGO@Cu‑TCPP+CS‑DA+AMPA。本发明能制备出一种可控抗菌、抗炎、导电、促血管生成的可注射水凝胶,适用于糖尿病创面愈合中的ROS过多导致的氧化应激、炎症、血管生成脆弱、细胞迁移增殖能力差和细菌感染,从而促进糖尿病创面愈合。
Description
技术领域
本发明属于生物材料技术领域,尤其涉及一种适用于糖尿病创面修复的可注射水凝胶的制备方法。
背景技术
皮肤伤口一般有慢性和急性伤口,急性伤口一般是一些因不可抗力的因素所导致的,例如摔伤、军伤和外科手术造成的伤口等。慢性伤口一般是一些因内在原因所导致的皮肤伤口难以愈合的伤口,例如糖尿病皮肤伤口和烧伤伤口,因为伤口处的过量的炎症、细菌感染等原因无法在三个月以内自动恢复其皮肤的功能完整性。糖尿病皮肤伤口会因为具有过多的活性氧(ROS)例如超氧阴离子、羟基自由基等从而引发持续的炎症阻碍创面愈合,ROS的增多一部分是因为高血糖(AGEs)会提高患者血液中的晚期糖化终产物,ROS不受控制的积累会导致伤口组织中的内源性干细胞、生长因子和核酸的显着破坏,从而极大地损害了它们的再生潜力,最终破坏了皮肤组织,加剧了感染,并延缓了伤口的愈合。另一部分是因为伤口部位的细菌感染产生的ROS还会对血管和内皮细胞造成显着损伤。细菌感染一直是对皮肤伤口的巨大威胁,特别是对于难以愈合的糖尿病伤口。更者,糖尿病伤口有明显的血管生成缺陷,这不仅会有利于一些厌氧的病原微生物的聚集,且还会限制关键的氧气和营养物质的运输,从而加重伤口部位的炎症,最终会导致糖尿病伤口愈合受损。综上,氧化应激过度、伤口细菌感染和血管生成脆弱并不是三个独立的个体,而是相辅相成、相互影响。
糖尿病伤口由于其不规则性,目前在临床上主要使用的治疗手段还是基于使用抗生素或辅助药物的保护性敷料。抗生素和药物会伴随着耐药性,易失活等副作用;敷料虽然可以适用于不规则的伤口且方便,但传统敷料只仅限于防止伤口细菌感染,不能清除糖尿病伤口的炎症渗出物且不能促进伤口愈合。因此,目前仍然迫切需要一种能够争对糖尿病伤口微环境的多功能材料。这种多功能材料最好能够提供伤口与外界气体交换,吸收炎症渗出物,抗菌,抗炎抗氧化等功能,从而促进糖尿病伤口修复。柔软湿润的水凝胶能够很好的将这些功能包裹齐全,但因为糖尿病伤口是不规则的,传统的水凝胶贴片不能完全的将伤口覆盖完全,可注射性水凝胶就能更方便快捷的覆盖不同规则的伤口,实用性大大增加。同时具有粘附性的可注射水凝胶可以有效防止在人体运动和局部压力下所导致的水凝胶脱落,抗感染能力下降等问题。
发明内容
针对糖尿病高糖环境中的皮肤创面愈合中氧化应激过度、慢性炎症、细菌感染、血管生成脆弱等问题,为设计出一种可控抗菌、抗炎、导电、促血管生成的可注射水凝胶。本发明提供一种适用于糖尿病创面修复的可注射水凝胶的制备方法。
本发明的一种适用于糖尿病创面修复的可注射水凝胶的制备方法,包括以下步骤:
步骤1:通过水热法制备pGO原位复合Cu-TCPP纳米片,即pGO@Cu-TCPP。
将3.6~4.4mg的4-羧基苯基卟啉TCPP溶解在N,N-二甲基甲酰胺DMF和无水乙醇体积比为3:1的4~8ml溶液中,直到TCPP溶解完全;3.0mg~3.6mg三水合硝酸铜CuNO3·3H2O,10mg聚乙烯吡咯烷酮PVP,40μL,1.0M三氟乙酸TFA溶解在N,N-二甲基甲酰胺DMF和无水乙醇体积比为3:1的12~16ml溶液中,并混合搅拌10~20min;将pGO:TCPP=1:4~1:2wt.的多巴胺还原氧化石墨烯pGO分散液滴加到TCPP混合液中,混合搅拌10~20min,滴加是通过注射器实现的,速率为0.2ml/min~0.4ml/min;将pGO-TCPP混合液加入到铜溶液中,混合搅拌10min~15min,加入是通过注射器实现的,速率为0.5ml/min~1ml/min;并使其分散均匀,分散是通过超声分散,时间为20min~30min;后将其混合液转移到高温反应釜中,在80℃,4h~24h下反应完全后通过将混合物离心获得pGO@Cu-TCPP二维纳米片。
步骤2:制备二氢咖啡酸接枝壳聚糖CS-DA。
0.4~0.6g的壳聚糖溶解在1~2%v/v的酸性溶液中,其pH=5.5~6.5,搅拌过夜;称取0.591~0.628g的二氢咖啡酸溶解在5~8ml的无水乙醇中,倒入上述酸性溶液中,倒入是通过注射器滴加,速率为1ml/min-2ml/min;1.25~1.5g的1-乙基-碳酰二亚胺EDC溶解在20~25ml的无水乙醇中,倒入上述混合液中,倒入是通过注射器滴加,速率为5ml/min-8ml/min;混合搅拌20h~24h,然后将CS-DA混合液使用透析袋MWCO 5~14kDa)用RO水透析纯化3~5天,最后将产物冻干得到CS-DA。
步骤3:制备氧化支链淀粉AMPA。
将6~8g的支链淀粉加入到50ml的RO水中,搅拌成淀粉乳;称取4.28~4.78mg的高碘酸钠NaIO4溶解在100~150ml的RO水中,溶解完全后将其在30min内加入到淀粉乳中,加入是通过注射器滴加,速度为5ml/min-10ml/min;30~37℃下避光反应4~5h,后加入1~1.5ml的乙二醇结束反应,并将混合液透析纯化3~5天,最后将产物冻干得到AMPA。
步骤4:制备pGO@Cu-TCPP+CS-DA+AMPA水凝胶。
称取步骤2中0.6~1g的CS-DA溶解在10ml的RO水中;称取步骤3中1~1.5g的AMPA在85~95℃下溶解10ml的RO水中;后CS-DA:AMPA=1:1v/v的AMPA溶液加入到0.5~2mg的pGO@Cu-TCPP中,摇匀后加入到CS-DA溶液中,并加入交联剂,即得到所需要的可注射pGO@Cu-TCPP+CS-DA+AMPA水凝胶。
进一步的,步骤1中,三水合硝酸铜CuNO3·3H2O替换成二水合氯化铜;配体聚乙烯吡咯烷酮PVP替换成吡嗪;配体三氟乙酸TFA替换成苯甲酸。
进一步的,步骤2中,酸性溶液是冰乙酸、盐酸中的一种;多酚物质二氢咖啡酸替换为多巴胺、没食子酸、咖啡酸中的一种。
进一步的,步骤3中,支链淀粉替换成直链淀粉、葡聚糖、透明质酸、海藻酸钠中的一种。
进一步的,步骤4中,交联剂为聚乙二醇二缩水甘油醚PEGDE。
上述的适用于糖尿病创面修复的可注射水凝胶的制备方法制备的水凝胶,其特征在于,水凝胶应用于解决糖尿病创面愈合中的ROS过多导致的氧化应激、炎症、血管生成脆弱、细胞迁移增殖能力差和细菌感染,从而促进糖尿病创面愈合。
本发明的有益成果是:
(1)本发明所使用的原位制备的pGO@Cu-TCPP纳米片的方法,是通过多巴胺还原氧化石墨烯(pGO)上多巴胺的酚羟基与Cu-TCPP上的羧基通过氢键原位复合。随着亲水性多巴胺还原氧化石墨烯(pGO)的加入,可增加Cu-TCPP在水凝胶中的分散性;pGO与TCPP的原位复合,可显著增强Cu-TCPP在NIR照射下的光动力效应。
(2)本发明的水凝胶是通过二氢咖啡酸接枝的壳聚糖(CS-DA)上的氨基与氧化支链淀粉上的醛基通过希夫碱成胶的。pGO@Cu-TCPP纳米片的掺入,一方面pGO@Cu-TCPP呈现负电性,可与带正电的CS-DA静电相互作用;另一方面pGO@Cu-TCPP上有大量的羧基、酚羟基,可与水凝胶主体CS-DA上的氨基、羟基及氧化支链淀粉上的羟基形成氢键等,增强水凝胶的内聚力;多酚物质二氢咖啡酸和pGO@Cu-TCPP纳米片上PDA以及作为粘性多糖的氧化支链淀粉三者可协同增强水凝胶的组织粘附性;多酚的加入可以赋予水凝胶优异的抗炎、抗氧化功能;多酚基团和多糖物质都具有优异的组织亲和性。
(3)由于导电聚合物多巴胺还原氧化石墨烯(pGO)的加入,与纯的Cu-TCPP基水凝胶相比,pGO@Cu-TCPP基组的水凝胶具有更优异的导电性,使得水凝胶能够通过电刺激促进糖尿病伤口处成纤维细胞迁移、增殖和分化,加速伤口愈合。
(4)本发明的水凝胶具有可注射性,可适应于不同面积,不同规则的糖尿病创面伤口;随着该水凝胶的降解,pGO@Cu-TCPP可缓慢持续的释放Cu2+促进糖尿病伤口部位的血管再生。
附图说明
图1为本发明实施例制备的Cu-TCPP的SEM图。
图2为本发明实施例制备的pGO@Cu-TCPP的SEM图。
图3为本发明实施例制备获得的水凝胶实物图。
图4为本发明实施例制备获得的水凝胶的猪皮粘附强度图。
图5为本发明实施例制备获得的水凝胶的自由基清除实验结果图。
图6为本发明实施例制备获得的水凝胶的体外抗菌实验结果图。
图7为本发明实施例制备获得的水凝胶的电导率图。
具体实施方式
下面结合附图和具体实施方法对本发明做进一步详细说明。
本发明的一种适用于糖尿病创面修复的可注射水凝胶的制备方法,包括以下步骤:
步骤1:通过水热法制备pGO原位复合Cu-TCPP纳米片(pGO@Cu-TCPP)。
将3.6~4.4mg的4-羧基苯基卟啉(TCPP)溶解在N,N-二甲基甲酰胺(DMF)和无水乙醇体积比为3:1(4~8ml)中,直到TCPP溶解完全;3.0mg~3.6mg三水合硝酸铜(Cu(NO3)2·3H2O),10mg聚乙烯吡咯烷酮(PVP),40μL,1.0M三氟乙酸(TFA)溶解在N,N-二甲基甲酰胺(DMF)和无水乙醇体积比为3:1(12~16ml)中,并混合搅拌10~20min;
将pGO:TCPP=1:4~1:2wt.的多巴胺还原氧化石墨烯(pGO)分散液缓慢滴加到TCPP混合液中,混合搅拌10~20min;将pGO-TCPP混合液缓慢加入到铜溶液中,混合搅拌10min~15min,并使其分散均匀,后将其混合液转移到高温反应釜中,在80℃,4h~24h下反应完全,后通过将混合物离心获得pGO@Cu-TCPP二维纳米片。
进一步的,缓慢滴加是通过注射器实现的,速率为0.2ml/min~0.4ml/min;缓慢加入是通过注射器实现的,速率为0.5ml/min~1ml/min;分散条件是通过超声分散,时间为20min~30min。
进一步的,三水合硝酸铜(CuNO3·3H2O)可替换成其它铜化合物,例如二水合氯化铜;配体PVP可替换成吡嗪;配体三氟乙酸(TFA)可替换成苯甲酸。
步骤2:制备二氢咖啡酸接枝壳聚糖(CS-DA)。
0.4~0.6g的壳聚糖溶解在1~2%v/v的酸性溶液中(pH=5.5~6.5),搅拌过夜;称取0.591~0.628g的二氢咖啡酸溶解在5~8ml的无水乙醇中,缓慢倒入上述酸性溶液中;1.25~1.5g的1-乙基-(3-二甲基氨基丙基)碳酰二亚胺(EDC)溶解在20~25ml的无水乙醇中,缓慢倒入上述混合液中;混合搅拌20h~24h,然后将CS-DA混合液使用透析袋(MWCO 5~14kDa)用RO水(3L去离子水添加3~5ml酸溶液)透析纯化3~5天,最后将产物冻干得到CS-DA;
进一步的,缓慢倒入指的是通过注射器滴加,速率为1ml/min-2ml/min;缓慢倒入指的是通过注射器滴加,速率为5ml/min-8ml/min。
进一步的,酸性溶液是冰乙酸,盐酸中的一种;多酚物质二氢咖啡酸可替换为多巴胺,没食子酸,咖啡酸。
步骤3:制备氧化支链淀粉(AMPA)。
将6~8g的支链淀粉加入到50ml的RO水中,搅拌成淀粉乳;称取4.28~4.78mg的高碘酸钠(NaIO4)溶解在100~150ml的RO水中,溶解完全后将其在30min内缓慢加入到淀粉乳中,30~37℃下避光反应4~5h,后加入1~1.5ml的乙二醇结束反应,并将混合液透析纯化3~5天,最后将产物冻干得到AMPA;
进一步的,缓慢加入是通过注射器滴加,速度为5ml/min-10ml/min;
进一步的,上述支链淀粉可替换成直链淀粉,葡聚糖,透明质酸,海藻酸钠等其它多糖物质。
步骤4:制备pGO@Cu-TCPP+CS-DA+AMPA水凝胶。
称取步骤2中0.6~1g的CS-DA溶解在10ml的RO水中;称取步骤3中1~1.5g的AMPA在85~95℃下溶解10ml的RO水中;后CS-DA:AMPA=1:1v/v的AMPA溶液加入到0.5~2mg的pGO@Cu-TCPP中,摇匀后加入到CS-DA溶液中,并加入交联剂,即得到所需要的一种适用于糖尿病创面修复的可控抗菌、抗炎、导电可注射pGO@Cu-TCPP+CS-DA+AMPA水凝胶;
进一步的,交联剂为聚乙二醇二缩水甘油醚(PEGDE)。
实施例1
将4.4mg的4-羧基苯基卟啉(TCPP)溶解在N,N-二甲基甲酰胺(DMF)与无水乙醇混合溶剂(DMF:无水乙醇=3:1,4ml)中,并混合搅拌到TCPP溶解完全;将多巴胺还原氧化石墨烯(pGO)通过超声分散在N,N-二甲基甲酰胺(DMF)中,后吸取1.1mg/ml,1ml的pGO分散液通过注射器以0.2ml/min-0.4ml/min的速率滴加到上述TCPP混合液中,混合搅拌10min;称取三水合硝酸铜(Cu(NO3)2·3H2O)3.6mg、聚乙烯吡咯烷酮(PVP)10mg、三氟乙酸(TFA)(40ul,1M)溶解在N,N-二甲基甲酰胺(DMF)与无水乙醇混合溶剂(DMF:无水乙醇=3:1,12ml)中,并混合搅拌10min;将TCPP-pGO混合液缓慢加入到CuNO3·3H2O-PVP-TFA中,混合搅拌10min-15min,并通过超声分散20min-30min,后将其混合液转移到高温反应釜中,在80℃,4h下反应完全,后通过将混合物离心(10000r.pm,5min)获得pGO@Cu-TCPP二维纳米片。
称取0.5g的壳聚糖溶解在50ml的2%v/v乙酸溶液中,搅拌过夜;称取0.591g的二氢咖啡酸溶解在5ml的无水乙醇中,通过输液袋滴加,速率为1ml/min-2ml/min缓慢倒入到CS溶液中混合搅拌;称取1.25g的1-乙基-(3-二甲基氨基丙基)碳酰二亚胺(EDC)溶解在20ml的无水乙醇中,通过输液袋滴加,速率为5ml/min-8ml/min缓慢倒入上述混合液中;混合搅拌20h-24h,然后将CS-DA混合液使用透析袋(MWCO 14,000Da)用去离子水透析纯化3-5天,最后将产物冻干得到CS-DA;
称取8g的支链淀粉加入到50ml的RO水中,搅拌成淀粉乳;称取4.28g的高碘酸钠(NaIO4)溶解在150ml的RO水中,溶解完全后将其高碘酸钠(NaIO4)溶液在30min内通过输液袋滴加,速度为5ml/min-10ml/min滴加到淀粉乳中,37℃下避光反应4.5h,后加入2ml的乙二醇结束反应,并将混合液透析纯化2-3天,最后将产物冻干得到AMPA;
pGO@Cu-TCPP浓度有0.2mg/ml、1mg/ml、5mg/ml,本实施例选用0.2mg/ml。称取1g的CS-DA溶解在10ml的RO水中;称取1.5g的AMPA在90℃下溶解在10ml的RO水中;后吸取与CS-DA等体积的5ml AMPA溶液加入到含有50mg的pGO@Cu-TCPP,摇匀后加入到5ml的CS-DA溶液中,并加入200ul的聚乙二醇二缩水甘油醚(PEGDE)交联剂,即得到所需要的一种适用于糖尿病创面修复的可控抗菌、抗炎、导电可注射pGO@Cu-TCPP+CS-DA+AMPA水凝胶。
实施例2
与实施例1基本相同,修改部分为pGO@Cu-TCPP的合成步骤,即三氟乙酸改为8.0mg吡嗪;加热时间改为24h。pGO@Cu-TCPP浓度改1mg/ml。
实施例3
与实施例1基本相同,修改部分为pGO@Cu-TCPP的合成步骤,即Cu(NO3)2·3H2O改为CuCl2·2H2O,加热时间改变为2h;pGO@Cu-TCPP浓度改5mg/ml。
实施例4
与实施例1基本相同,修改部分为制备pGO@Cu-TCPP+CS-DA+AMPA水凝胶,即,1g的CS-DA改变为0.5g,1.5g的AMPA改为1.0g。
说明书附图1、图2所示本发明的Cu-TCPP、pGO@Cu-TCPP的SEM图。比例尺分别为(5μm、3μm)图中可以看出来,纯的Cu-TCPP纳米片的表面平滑;而pGO与Cu-TCPP原为复合的pGO@Cu-TCPP可以在表面明显的观察到属于pGO的褶皱形貌,证明两者复合成功。
图3为本发明实施例制备获得的水凝胶应用状态图。图中可以看出pGO@Cu-TCPP在水凝胶中具有良好的分散性,整个水凝胶呈现紫黑色,pGO@Cu-TCPP+CS-DA+AMPA水凝胶具有优异的粘附性,可黏附于皮肤不脱落,且在手指弯曲90°后仍保持优异的粘附性。
附图4所示本发明的水凝胶的猪皮粘附强度图,通过将制备的不同浓度的pGO@Cu-TCPP+CS-DA+AMPA水凝胶原位注射到两猪皮之间,后在万能试验机上进行测试,加载力为2N,拉伸速率为20mm/min。水凝胶样品从猪皮上脱落,实验结束。可以看出加入合适浓度的pGO@Cu-TCPP可以增强水凝胶的粘附力,这是因为pGO上的多酚起到主导作用。
附图5图示本发明的水凝胶的清除自由基的实验结果。图5A展示了加了二氢咖啡酸修饰的壳聚糖-氧化支链淀粉(CS-DA+AMPA)基水凝胶和DPPH自由基随着时间的紫外光谱;图5B展示了没加二氢咖啡酸的CS-AMPA基水凝胶与加了二氢咖啡酸的CS-DA+AMPA基水凝胶随着时间的清除DPPH自由基的效率图。结果表明,多酚物质二氢咖啡酸的加入,可以在25min就能达到清除DPPH自由基85%左右,而没加多酚组在25min仅能达到25%左右的清除率。
附图6图示本发明的水凝胶的体外抗菌实验结果图。图6A展示了不同水凝胶组对大肠杆菌的体外抗菌;图6B展示了不同水凝胶组对表皮葡萄球菌的体外抗菌。细菌浓度为(1×109CFU/mL,100uL),光照时间10min,共培养12h后吸取200uL上清液在酶标仪600nm读取吸光度。水凝胶共四组:CS+AMPA组、CS-DA+AMPA、Cu-TCPP+CS-DA+AMPA、pGO@Cu-TCPP+CS-DA+AMPA组,需要光照的为后两组,前两组在后两组光照途中使用同样的共培养时间。
附图7所示本发明的水凝胶的电导率图。其电导率方法:根据两电极法采用电化学工作站测定水凝胶的电导率;实验组:Cu-TCPP+CS-DA+AMPA水凝胶,pGO@Cu-TCPP+CS-DA+AMPA水凝胶;对照组:CS-DA+AMPA水凝胶。可以看出pGO@Cu-TCPP+CS-DA+AMPA水凝胶的电导率高于其它两组,即pGO的引入增强了水凝胶的电导性。
本发明首先制备了一种pGO原位复合Cu-TCPP纳米片,然后还分别制备了水凝胶前提CS-DA,AMPA;然后将pGO@Cu-TCPP纳米片掺杂到水凝胶在制备得到适用于糖尿病创面修复的可控抗菌、抗炎、导电可注射pGO@Cu-TCPP+CS-DA+AMPA水凝胶。pGO@Cu-TCPP纳米片均匀分散在水凝胶内部结构中;且提高了水凝胶的光动力效应,使得可以在较短的时间产生更多的单线态氧自由基,缩短实验时间,亦能更有效的实现抗菌效果;由于氧化还原石墨烯的导电性,该水凝胶还具有优异的导电性;随着多酚物质二氢咖啡酸与pGO上的部分多巴胺赋予了水凝胶较好的粘附性与抗炎、抗氧化能力;CS-DA与AMPA通过希夫碱成胶侯仍然可以注射到不规则的糖尿病伤口。实现了能够修复糖尿病创面愈合的可控抗菌、导电、抗炎可注射水凝胶的目的。
Claims (5)
1.一种适用于糖尿病创面修复的可注射水凝胶的制备方法,其特征在于,包括以下步骤:
步骤1:通过水热法制备pGO原位复合Cu-TCPP纳米片,即pGO@Cu-TCPP:
将3.6~4.4mg的4-羧基苯基卟啉TCPP溶解在N,N-二甲基甲酰胺DMF和无水乙醇体积比为3:1的4~8ml溶液中,直到TCPP溶解完全;3.0mg~3.6mg三水合硝酸铜Cu(NO3)2·3H2O,10mg聚乙烯吡咯烷酮PVP,40µL,1.0M三氟乙酸TFA溶解在N,N-二甲基甲酰胺DMF和无水乙醇体积比为3:1 的12~16ml溶液中,并混合搅拌10~20min;将pGO:TCPP=1:4~1:2wt.的多巴胺还原氧化石墨烯pGO分散液滴加到TCPP混合液中,混合搅拌10~20min,滴加是通过注射器实现的,速率为0.2ml/min~0.4ml/min;将pGO-TCPP混合液加入到铜溶液中,混合搅拌10min~15min,加入是通过注射器实现的,速率为0.5ml/min~1ml/min;并使其分散均匀,分散是通过超声分散,时间为20min~30min;后将所得混合液转移到高温反应釜中,在80℃,4h~24h下反应完全后通过将混合物离心获得pGO@Cu-TCPP二维纳米片;
步骤2:制备二氢咖啡酸接枝壳聚糖CS-DA:
0.4~0.6g的壳聚糖溶解在1~2%v/v的酸性溶液中,其pH=5.5~6.5,搅拌过夜;称取0.591~0.628g的二氢咖啡酸溶解在5~8ml的无水乙醇中,倒入壳聚糖酸性溶液中,倒入是通过注射器滴加,速率为1ml/min-2ml/min;1.25~1.5g的1-乙基-(3-二甲基氨基丙基)碳酰二亚胺EDC溶解在20~25ml的无水乙醇中,倒入混合液中,倒入是通过注射器滴加,速率为5ml/min-8ml/min;混合搅拌20h~24h,然后将CS-DA混合液使用透析袋 MWCO 5~14kDa用RO水透析纯化3~5天,最后将产物冻干得到CS-DA;
步骤3:制备氧化支链淀粉AMPA:
将6~8g的支链淀粉加入到50ml的RO水中,搅拌成淀粉乳;称取4.28~4.78mg的高碘酸钠NaIO4溶解在100~150ml的RO水中,溶解完全后将其在30min内加入到淀粉乳中,加入是通过注射器滴加,速度为5ml/min-10ml/min;30~37℃下避光反应4~5h,后加入1~1.5ml的乙二醇结束反应,并将所得混合液透析纯化3~5天,最后将产物冻干得到AMPA;
步骤4:制备pGO@Cu-TCPP+CS-DA+AMPA水凝胶:
称取步骤2中0.6~1g的CS-DA溶解在10ml的RO水中;称取步骤3中1~1.5g的AMPA在85~95℃下溶解10ml的RO水中;后CS-DA:AMPA=1:1v/v的AMPA溶液加入到0.5~2mg的pGO@Cu-TCPP中,摇匀后加入到CS-DA溶液中,并加入交联剂,交联剂为聚乙二醇二缩水甘油醚PEGDE,即得到所需要的可注射pGO@Cu-TCPP+CS-DA+AMPA水凝胶。
2.根据权利要求1所述的一种适用于糖尿病创面修复的可注射水凝胶的制备方法,其特征在于,所述步骤1中,三水合硝酸铜Cu(NO3)2·3H2O替换成二水合氯化铜;配体聚乙烯吡咯烷酮PVP替换成吡嗪;配体三氟乙酸TFA替换成苯甲酸。
3.根据权利要求1所述的一种适用于糖尿病创面修复的可注射水凝胶的制备方法,其特征在于,所述步骤2中,酸性溶液是乙酸、盐酸中的一种。
4.根据权利要求1所述的一种适用于糖尿病创面修复的可注射水凝胶的制备方法,其特征在于,所述步骤3中,支链淀粉替换成直链淀粉、葡聚糖、透明质酸、海藻酸钠中的一种。
5.根据权利要求1~4任一所述的适用于糖尿病创面修复的可注射水凝胶的制备方法制备的水凝胶,其特征在于,所述水凝胶应用于解决糖尿病创面愈合中的ROS过多导致的氧化应激、炎症、血管生成脆弱、细胞迁移增殖能力差和细菌感染,从而促进糖尿病创面愈合。
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